I don't know at this point if this would be possible, but I will try and find out on my end. There's a bug that has been logged that you should know about: NIM084728 - ArcGIS for Desktop gives the wrong impression that a user can create an Administrator connection using the credentials of a user with Publisher privileges. This is going to be addressed soon.

I don't know at this point if this would be possible, but I will try and find out on my end. There's a bug that has been logged that you should know about: NIM084728 - ArcGIS for Desktop gives the wrong impression that a user can create an Administrator connection using the credentials of a user with Publisher privileges. This is going to be addressed soon.